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Chihiro is the dorm teacher of Sakurasou Dormitory and an art teacher of Suiko. Despite being a teacher, Chihiro is lazy and only cares about drinking alcohol and trying to date men. Despite being a teacher, she often gives Sorata improper advice. She is Mashiro's cousin and is the one who arranges the transfer, but she forces Sorata to take care of Mashiro due to her laziness. She was a conscientious student of Suiko, and wanted to become a professional artist, but she changed and became an art teacher for unknown reasons instead.

Maid is Ryuunosuke's artificial intelligence (AI) program he wrote personally. Originally, Ryuunosuke designed Maid to filter and automatically reply to his cellphone messages and emails to save him time. However, Ryuunosuke keeps expanding Maid's AI ability. Maid is now capable of blocking and replying to a message or email by her own preference, using new words she has recently learned from other messages, emails, or the Internet in the reply, giving Sorata solid advice for his computer game program, anticipating people's emotions with cameras, writing computer or cellphone viruses and sending them out by herself, or even hacking into Suiko's computer to steal information. The only way to distinguish Maid's message from those from a human is that she replies too quickly. Ryuunosuke lets Maid enter a social networking service, with most people who meet her not realizing she is an AI program. According to Ryuunosuke, his ultimate goal is to give Maid an artificial body and become a real human.

Ryuunosuke is the resident of room 102. Ryuunosuke is a second-year student of Suiko. He is a hikikomori who rarely leaves his room, and usually communicates with others with cellphone message or e-mails. To reduce the need to communicate with others, he has written the "Maid" program. He is an expert of computer programming, and contributes lots of useful advice and information to Sorata for the latter's computer game. According to Ryuunosuke, his ultimate goal is to make Maid become a real human.

Jin is the resident of room 103. Jin is a third-year student of Suiko. He is Misaki's childhood friend and a playboy. He has dated several girls, including Misaki's elder sister, but in the end he breaks up with all of them.

Misaki is the resident of room 201. Misaki is a third-year-student of Suiko who later attends Suimei University of the Arts. She is very outgoing and optimistic. Sorata often refers to her as an "alien". She has very good grades and is very good at drawing, but the school decided to send her to Sakurasou Dormitory because she pays too much attention on drawing anime and manga. She is very good at making animation and can handle most work in making one without help from others. She has already sold an animation to a famous publishing company and made enough of a fortune for the rest of her life.

Nanami is Sorata's classmate. Although she is harsh toward Sorata, she actually has a crush on him, and everyone aside from Sorata has noticed this. She escaped from her home to become a voice actress and thus has to live on her own.

Sorata is the male protagonist of the story. He is a second-year student of Suiko, who lives in room 101 of Sakurasou Dormitory. He was kicked out of the standard school dorm after he chose not to throw away a stray cat he picked up. As many of the Sakurasou Dormitory residents have outstanding grades and art skills, he often feels plain and normal among them. He is chosen by Chihiro to take care of Mashiro's daily life, although he resists at first, but he ends up getting used to it.